Forum: RSpec should validate_numericality_of with greater_than_or_equal_to

Announcement (2017-05-07): www.ruby-forum.com is now read-only since I
unfortunately do not have the time to support and maintain the forum any
more. Please see rubyonrails.org/community and ruby-lang.org/en/community
for other Rails- und Ruby-related community platforms.

Hello,
I have this in my spec
it { should
validate_numericality_of(:amount).greater_than_or_equal_to(0) }
but I get error:
Failure/Error: it { should
validate_numericality_of(:amount).greater_than_or_equal_to(0) }
NoMethodError:
undefined method `greater_than_or_equal_to' for
#<RSpec::Matchers::Matcher:0xef23150>
this page
http://remarkable.rubyforge.org/activerecord/class...
has method
it { should validate_numericality_of(:age).only_integer }
and :less_than_or_equal_to is a valid option..
I am confused. How do I spec this? thanks.